TP-Link TL-WR940N V4/TL-WR841N V11 WanSlaacCfgRpm.htm dnsserver1 buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.3$0-$5k0.00

Summaryinfo

A vulnerability was found in TP-Link TL-WR940N V4 and TL-WR841N V11. It has been declared as critical. The affected element is an unknown function of the file /userRpm/WanSlaacCfgRpm.htm. Such manipulation of the argument dnsserver1 leads to buffer overflow. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is documented as CVE-2025-6151. The attack can be executed remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in TP-Link TL-WR940N V4 and TL-WR841N V11 (version now known). Affected by this issue is some unknown processing of the file /userRpm/WanSlaacCfgRpm.htm. The manipulation of the argument dnsserver1 with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability has been found in TP-Link TL-WR940N V4 and TL-WR841N V11. Affected by this issue is some unknown functionality of the file /userRpm/WanSlaacCfgRpm.htm, which may lead to buffer overflow. The attack may be launched remotely. This vulnerability only affects products that are no longer supported by the maintainer.

The advisory is available at github.com. This vulnerability is handled as CVE-2025-6151. The exploitation is known to be easy. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. Technical details as well as a public exploit are known. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/16/2025).

The exploit is available at github.com. It is declared as proof-of-concept. By approaching the search of inurl:userRpm/WanSlaacCfgRpm.htm it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-18451). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.3

VulDB Base Score: 9.8
VulDB Temp Score: 9.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
Google Hack: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/15/2025 🔍
06/15/2025 +0 days 🔍
07/16/2025 +31 days 🔍

Sourcesinfo

Vendor: tp-link.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-6151 (🔍)
GCVE (CVE): GCVE-0-2025-6151
GCVE (VulDB): GCVE-100-312626
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/15/2025 20:45
Updated: 07/16/2025 07:13
Changes: 06/15/2025 20:45 (56), 06/17/2025 11:41 (31), 06/17/2025 16:08 (1), 06/19/2025 11:01 (1), 07/03/2025 07:30 (2), 07/16/2025 02:47 (5), 07/16/2025 07:13 (26)
Complete: 🔍
Submitter: MTHG
Cache ID: 216::103

Submitinfo

Accepted

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